Screw-thread gauge



May 20, 1958 J. F. GULYBAN SCREW-THREAD GAUGE Filed March 18, 1955INVENTOR.

Jb/IN f: Gag 541v BY flrroeus ys United States Patent SCREW-THREAD GAUGEJohn F. Gulyban, Cleveland, Ohio Application March 18, 1955, Serial No.495,186 2 Claims. (Cl. 33-199) This invention is for an improvedscrew-thread gauge.

My present improvement relates to the well-known form of screw-threadgauge which has a polygonal-shaped handle or holder portion with ascrew-threaded member aflixed within each end thereof. ()ne end ismarked Go and the other end is marked No G; which of course means thatwhen the threaded member at the Go end fits Within the hole that hasbeen tapped but the threaded member at the No Go end can not be screwedinto the tapped hole, then the thread of the tapped hole is correct.

Because of the special character of the metal in the screw-threadedmember at the Go end and its required accuracy and dependability, it israther an expensive item; and thus when it becomes necessary to replacethis screw-threaded member due to breakage or wear, as is often the,case, there is entailed considerable expense.

It is therefore the object of my present invention to devise a meanswhereby the screw-threaded'member at the Go end of such a gauge may, inthe event of breakage, be readily moved outwardly along its holder orhandle or, in case it becomes worn so that it is under-size, it

, may be reversed; thereby prolonging the life of usefulness of thisthreaded member with a corresponding saving in cost over a prolongedperiod of time.

A further object consists in the specific form of structure which makespossible this improvement, as hereinafter more fully disclosed.

Other objects will appear from the following description and claims whenconsidered together with the accompanying drawing.

Fig. 1 is a view, partly in section and partly in elevation, of ascrew-thread gauge embodying my present invention;

Fig. 2 is a view taken on line 2-2 of Fig. l; and

Fig.3 is a view taken on line 33 of Fig. 1.

It is to be understood that the present form of disclosure is merely forthe purpose of illustration and that there might be devised variousmodifications thereof without departing from the spirit of my inventionas herein set forth and claimed.

Referring now to the accompanying drawing in detail, the conventionaland familiar polygonal form of handle or holder 1 has a screw-threadedmember 2 afiixed Within the No Go end thereof, and the screw-threadedmember 3 removably and adjustably mounted within the Go end thereof.Although my present illustration shows only the manner of mounting thescrew-threaded member 3 within the holder or handle 1 at the Go endthereof, it is to be understood that this same invention may be providedat the No Go end also.

According to my present invention, I mount the screwthreaded member 3within an internally screw-threaded bushing 4 of softer metal than thatof the member 3 and secure the member 3. therewithin by means of theAllen set screw 5 which will have binding engagement with the inner endof the screw member 3. The bushing 4, in turn, is secured within thehandle or holder 1 by means of the Allen set screw 6 which may have itsouter end flush with the surface of the handle 1. Engagement of theinner end of the set screw 5 with the inner end of the screw-threadedmember 3 will prevent the same from accidentallyturning and thus themember 3 will be retained in the position in which set. The bushing 4may be of any desired length and will be sufliciently long to ensure thefirm positioning of the screw-threaded member 3 therewithin and also toallow suitable extent of adjustment of the member 3 there- Within.

Thus, upon breaking of the screw-threaded member 3, it can be readilyremoved with its bushing by merely loosening the set screw 6 and thesetscrew 5 may be released so as to permit member 3 to be moved outwardlyalong the bushing, whereupon the set screw 5 may be again set so as tohold the member 3 in the set position. Or, in case of wear of the member3, it may be reversed longitudinally within its bushing 4 by firstloosening the set screw 6 so as to remove the bushing and then releasingthe set screw 5 so as to free the member 3 for the reversing of thesame, whereupon the set screw 5 will again be tightened against theinner end of the member 3 so as to hold it in its new position.

It will therefore be seen that I have devised an improvement that iscalculated to prolong the life of usefulness of the screw-threadedmember 3 and also of the member 2; and, from actual experience, thisimprovement should mean a substantial saving annually in the averageshop where such a gauge is used. Moreover, this improvement is of asimple nature and is not at all costly to provide.

What I claim is:

1. A screw-thread gauge comprising a rigid holder having a hollow endwith uniform inside diameter through out, a bushing with uniform outsidediameter throughout removably and longitudinally adjustably mountedwithin the hollow end of said holder, a readily removable set screw forholding said bushing in position, a screwthreaded member removably andlongitudinally adjustably mounted within said bushing, and a readilyremovable set screw for holding said screw-threaded member within saidbushing.

2. A screw-thread gauge comprising a rigid holder having a hollow endwith uniform inside diameter throughout, a bushing of comparatively softmaterial with uniform outside diameter throughout removably andlongitudinally adjustably mounted within the hollow end of said holder,a readily removable set screw for holding said bushing in position, ascrew-threaded member of comparatively hard material havinglongitudinally adjustable screw-threaded engagement within said bushing,and a readily removable set screw for holding said screwthreaded memberwithin said bushing.

References Cited in the file of this patent UNITED STATES PATENTS903,484 Lane et al Nov. 10, 1908 1,339,573 Pettibone May 11, 19201,588,362 Hanson June 8, 1926 1,654,233 Bath Dec. 27, 1927 2,345,750Hohwart Apr. 4, 1944 FOREIGN PATENTS 146,436 Sweden May 26, 1954

